One-pot synthesis of ultra-small cerium oxide nanodots exhibiting multi-colored fluorescence

Krishnan, Asha; Sreeremya, Thadathil S.; Murray, Eoin; Ghosh, Swapan K.

doi:10.1016/j.jcis.2012.09.009

Cited by 41 publications

(47 citation statements)

References 51 publications

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“…46 In the Ce 3d spectrum, v o , v 1 , u o , and u 1 peaks are attributed to Ce 3+ ; while v, v'', v''', u, u'' and u''' are the characteristic peaks of Ce 4+ ions. The concentrations of Ce 3+ in all the products were estimated using the integrated area of each peak in the spectrum, the values are given in Table S1.…”

Section: Xps and Raman Spectral Analysismentioning

confidence: 92%

“…46,47,49 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 exposure of more reactive {100} surfaces, followed by {110} surfaces, can facilitate the formation of oxygen vacancies in them, 10,12 and introduce enhanced oxygen storage capacity in the material as shown in Table 2. We note that the OSC as determined by thermogravimetry, 47 …”

Section: Xps and Raman Spectral Analysismentioning

confidence: 99%

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Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity

Sreeremya

Krishnan

Remani

et al. 2015

ACS Appl. Mater. Interfaces

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The catalytic performance of a range of nanocrystalline CeO2 samples, prepared to have different morphologies, was measured using two accepted indicators; oxygen storage and diesel soot combustion. The same powders were characterized in detail by HR-TEM, XRD, XPS, and Raman methods. The study demonstrates that activity is determined by the relative fraction of the active crystallographic planes, not by the specific surface area of the powders. The physical study is a step toward quantitative evaluation of the relative contribution to activity of the different facets. The synthetic protocol permits fabrication of CeO2 nanostructures with preferentially grown active planes, and therefore has potential in developing catalytic applications and in nanocompositing.

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Section: Xps and Raman Spectral Analysismentioning

confidence: 92%

Section: Xps and Raman Spectral Analysismentioning

confidence: 99%

Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity

Sreeremya

Krishnan

Remani

et al. 2015

ACS Appl. Mater. Interfaces

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“…5). The Raman active mode is attributed to a symmetrical stretching of Ce 8O, which generally corresponds to F 2g Raman active mode of fluorite cubic structure [15,32].…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 97%

Mycogenesis of cerium oxide nanoparticles using Aspergillus niger culture filtrate and their applications for antibacterial and larvicidal activities

et al. 2015

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Cerium oxide nanoparticles (CeO 2 NPs) were synthesized using Aspergillus niger culture filtrate. The mycosynthesized CeO 2 NPs were characterized by UVVisible (UV-Vis), Fourier Transform Infrared (FT-IR), X-ray diffraction (XRD), Micro Raman, Thermogravimetric/Differential Thermal Analysis (TG/DTA), Photoluminescence, and Transmission Electron Microscopy (TEM) analyses. UV-Vis spectrum exhibited a corresponding absorption peak for CeO 2 NPs at 296 nm, and the functional groups present in the fungal filtrate responsible for the synthesis of NPs were analyzed by FT-IR. The further characterization of the mycosynthesized CeO 2 NPs revealed particles of the cubic structure and spherical shape, with the particle sizes ranging from 5 to 20 nm. The antibacterial activity of CeO 2 NPs was examined in respect of two Gram-positive (G?) bacteria (Streptococcus pneumoniae, Bacillus subtilis) and two Gram-negative (G-) bacteria (Proteus vulgaris, Escherichia coli) by disk diffusion method. The test results for CeO 2 NPs at a concentration of 10 mg/mL showed higher activities on the zone of inhibition of up to 10.67 ± 0.33 and 10.33 ± 0.33 mm against Streptococcus pneumonia and Bacillus subtilis, respectively, The CeO 2 NPs caused 100 % mortality on first instar of Aedes aegypti at 0.250 mg/L concentration after 24-h exposure. The mycosynthesis of CeO 2 NPs is a simple, cost-effective and eco-friendly approach and it will also potentially helpful to control pathogenic bacteria and dengue vector.

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“…The presence of the surface oxygen vacancies in the materials was monitored by UV-Raman spectroscopy (Fig. 35,37,38 The relative density This journal is © The Royal Society of Chemistry 2015 of the defect sites ($560 cm À1 ) in nanoparticulate CeO 2 was higher in HT1 compared to that in AP. The main peak at ca.…”

Section: Role Of Ce 3+ /Defects: Xps and Raman Spectral Analysismentioning

confidence: 99%

Tailoring the surface properties of cerium oxide nanoabrasives through morphology control for glass CMP

2015

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Nanosized cerium oxide (CeO 2 ) particles possessing different morphologies like nanorods, nanocubes and nanospheres have been successfully synthesized by a simple one step, surfactant free, precipitation technique and by hydrothermal methods. The diverse morphology motifs were further utilized for the planarization of silicate glass with an initial surface roughness of $40 nm and we observed a strong morphology dependence of the abrasive in glass polishing. Polishing efficiency of the nanoabrasives in terms of the mass removal and surface roughness was investigated using a table top lapping machine.Surface roughness analysis by atomic force microscopy reveals that the ceria nanostructure with a mixed morphology of rods and cubes could produce a surface finish of $3Å. The surface properties of the abrasive were found to play a key role in polishing as evidenced by X-ray photoelectron spectroscopy and Raman spectral analysis. The powder contact angle/hydrophilicity of the nanopowders followed the same trend as that of the dipolar (200) plane and [Ce 3+ ]. This work has shown promise in polishing efficiency with nano CeO 2 slurry to achieve nanolevel planarity on glass substrates, which is desirable for the global planarization of complex device topography.

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One-pot synthesis of ultra-small cerium oxide nanodots exhibiting multi-colored fluorescence

Cited by 41 publications

References 51 publications

Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity

Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity

Mycogenesis of cerium oxide nanoparticles using Aspergillus niger culture filtrate and their applications for antibacterial and larvicidal activities

Tailoring the surface properties of cerium oxide nanoabrasives through morphology control for glass CMP

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